Grate-bar



UNITED STATES -PATENT 'OFFICEl WARREN E. HILL, OE BROOKLYN, NEW

GRAT

Specification forming the accompanying drawings form a part ot" this description.

Figurel is a side view of three sections or lengths of' such grate-bar. Fig. 2 is a plan View, shenzngsmrer ll bars sido by side on a larger scale. Fig. 3 is a side view ot'a single bar, a part heilig removed at one point to allow room for Fig. 4. Fig. 4 is a cross-section ofthe same bar. Fig. 5 is a horizontal section ot' a portion of' the bar. Fig. (i is a cross-se tion of the bar through the center or deepest point, and Fig. 7 is an end view.

Similar letters of' reference parts in all the figures.

The chief' purpose ot' my invention is to keep the material of the bars cool. "his is -etected by leading currents ofairthrough the interior of' each grate-bar -in the manner to he described below.

Referring to the drawings, L is the top or main upper surface of' the. bar, represented slightly hollow, as usual, to retain ashes, and M and N are thin lower portions, all cast in a single piece.-

Eis the space between the lower parts or ind ica-te like sides, M and N.

G Gr, &c., are holes communicating from the upper part of the space' E to the exterior of he bar at each side. The space E is, by pref'- erenee, continuous from one end of the bar to the other, or for a considerable portion of the distance, though it may be interrupted byforming connection across at intervals, to stiften and mutually brace the parts M and N. The

holes G may be made a little-larger or may be part of Letters latent .\oA fil/155.

YORK.

E-BAR.

ciatvzit December l2, 186,5.

t considerable smaller than is here represented withoutdeparting from the principle of the invention; but l pref'er the form and proportions of' all the parts here represented.

The heat communicated to the upper edge of each bar is conducted downward through the material ot' the bar, and is cooled by th'e ascending air, which passes up through the grate to supply the tire; b'nt'instead of finding only the two sides and the narrow lower edge trom which to radiate oreonvect the heat into such air, this invention presents the additional surface Ot' the Whole 4inner facesv ot' the sides M and N, as also the surfaces around the holes G, and is cooled more rapidly and eftectually. In other words, cnlrents of air, received in thc bottom of' each grate-bar and discharged through the holes G at the sides, cool the bar in l addition tO the ordinary currents which tlow up past each side of' the The hollow in the upper edge Ot' the gratebar to retain ashes is no part ot' niuvinvention. It may be dispensed with altogether, it desired. The same is truc ofthe deep trusswork represented below thc sides M and N, which may be cast on the bar -or not, as pre ferred, and also of' the peculiar hollow side bearings, a., which perform thel ordinary f'unctions ot' holding the grate-bars at the proper distance apart.

Having now f'nlly har.

described my invention, what I claim as new, and desire to secure by I Letters Patent, is as follows:

The longitudinal space'E, in combination with the transverse air-passages G, and adapted to allow the ascent ot' air between the sides M and N and its discharge into the spaces at the sides of' the bar, substantiallyv in the manner and for the purpose herein speciiicd.

vWARREN' E. HILL. Witnesses STEPHEN I. SIMMONS, K. W. STETSON. 

